The mother of a missing Chibok girl on a march with other women calling for their daughters to be brought back homeReuters/Akintunde Akinleye

The Nigerian government has dismissed allegations that a would-be suicide bomber arrested in Cameroon is one of the 219 schoolgirls kidnapped by Boko Haram terrorists in Nigeria in 2014. The girl was arrested along with a female accomplice by local defence volunteers in the village of Limani.

Parents of the abducted schoolgirls were to travel to Cameroon to verify the child suicide bomber's claim. However, a senior official told the BBC the girl was not one of the missing students, who were kidnapped as they were attending evening school in Chibok, a village in the restive Borno state, in April 2014.

Who are Nigeria's Boko Haram terrorists?

Boko Haram, which has renamed itself Iswap, fights against Western influence in Nigeria and aims to impose its version of Sharia law throughout occupied territories.

The group carries out attacks in Nigeria and neighbouring countries in a bid to take control of more territory. Three Nigerian states − Adamawa, Borno and Yobe − have been under a state of emergency since May 2013.

Boko Haram has killed 20,000 people since 2009 and was deemed the world's deadliest terror group, surpassing its ally, Islamic State (Isis/Daesh), in November 2015.

The mass-abduction stirred international outrage and shed light on the deadly insurgency of Boko Haram that, until then, had remained under-reported.

Boko Haram primarily carries out attacks in northern Nigeria and northern Cameroon. The group is renowned for kidnapping civilians, mainly women and children, and forcing them to carry out suicide bombing missions in crowded areas.

Earlier this year, President Muhammadu Buhari ordered a fresh investigation into the kidnapping of the 219 girls. The president approved the new probe after meeting some parents of the missing girls as well as members of the Bring Back Our Girls movement, which had organised a march in the federal capital of Abuja.